sched: convert struct sched_group/sched_domain cpumask_ts to variable bitmaps

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Impact: (future) size reduction for large NR_CPUS.

We move the 'cpumask' member of sched_group to the end, so when we
kmalloc it we can do a minimal allocation: saves space for small
nr_cpu_ids but big CONFIG_NR_CPUS.  Similar trick for 'span' in
sched_domain.

This isn't quite as good as converting to a cpumask_var_t, as some
sched_groups are actually static, but it's safer: we don't have to
figure out where to call alloc_cpumask_var/free_cpumask_var.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Rusty Russell 2008-11-25 02:35:04 +10:30 • committed by Ingo Molnar

parent 758b2cdc6f

commit 6c99e9ad47

2 changed files with 48 additions and 28 deletions

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11

include/linux/sched.h

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65

kernel/sched.c

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